Sources

https://unsolved.com/gallery/arnold-archambeau-ruby-bruguier/

https://unsolvedmysteries.fandom.com/wiki/Arnold_Archambeau_and_Ruby_Bruguier

https://www.grunge.com/725658/the-mysterious-deaths-of-arnold-and-ruby

https://www.reddit.com/r/Missing411/comments/b43eta/the_disturbing_deaths

https://anchor.fm/joe-shwartz2/episodes/26---The-Deaths-of-Arnold\Ruby

https://www.onlyinyourstate.com/south-dakota/unsolved-murder-mystery-sd/

https://www.sarahjwinter.net/2019/02/into-unknown-arnold-archambeau-ruby.html

https://truecrimediva.com/arnold-archambeau-ruby-bruguier/

http://coldcasetheories.blogspot.com/2013/01/the-case-that-haunts-me.html